Department of Chemistry, Sant Gadge Baba Amravati University, Amravati-444 602, Maharashtra, India E-mail : aswaranand@gmail.com Manuscript received online 03 December 2014, revised 19 January 2015, accepted 27 January 2015 Metal polychelates of the type [ML.(2H2O)X]Y where M = CrIII, MnIII, FeIII, TiIII, ZrIV, VOIV, MoO2 VI , UO2 VI; X = H2O, Y = Cl with 4,4´-bis[(I-propanesalicylaldimine-5)azo]biphenyl (L) have been synthesized. Their structures have been proposed on the basis of elemental

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... lysis, magnetic susceptibility measurements, IR and diffuse reflectance spectra and thermogravimetric analyses. 1H NMR spectrum of the ligand clearly indicates the presence of OH and azomethine groups. The polychelates are dark colored and insoluble in common organic solvents. Their thermograms showed the loss of water of hydration in first step followed by decomposition of ligand molecule. The thermal data have also been analyzed for the kinetic parameters using Horowitz-Metzger method. The electrical conductivity of ligand and its polychelates showed semiconducting behavior. All the polychelates were found to be active against a variety of bacteria.